diff --git a/gstreamer-base/src/lib.rs b/gstreamer-base/src/lib.rs
index bb70667d8..f60368c8b 100644
--- a/gstreamer-base/src/lib.rs
+++ b/gstreamer-base/src/lib.rs
@@ -61,6 +61,10 @@ mod base_transform;
 pub mod base_parse_frame;
 pub use base_parse_frame::BaseParseFrame;
 
+pub const BASE_TRANSFORM_FLOW_DROPPED: gst::FlowSuccess = gst::FlowSuccess::CustomSuccess;
+pub const BASE_PARSE_FLOW_DROPPED: gst::FlowSuccess = gst::FlowSuccess::CustomSuccess;
+pub const AGGREGATOR_FLOW_NEED_DATA: gst::FlowError = gst::FlowError::CustomError;
+
 // Re-export all the traits in a prelude module, so that applications
 // can always "use gst::prelude::*" without getting conflicts
 pub mod prelude {